class Path(object):
    @staticmethod
    def db_dir(database):
        if database == 'ucf101':
            # folder that contains class labels (data前不能加斜线)
            root_dir = 'data/UCF101'
            # Save preprocess data into output_dir (data前不能加斜线)
            output_dir = 'data/UCF101_preprocessed'
            return root_dir, output_dir
        else:
            print('Database {} not available.'.format(database))
        raise NotImplementedError

    @staticmethod
    def model_dir():
        # 预训练权重文件路径，models前不能加斜线，如果是不需要可以返回空字符串
        # return 'models/c3d-pretrained.pth'
        return ''